Insulating head for pistons



Feb. 5 1924.-

1,482,778 a. BIOWMAR I INSIjLATING HEAD FOR PISTONS Original Filed Au 5.1922 o i1 z 1 o I I i ,r 2' J'hven t :23 8.50MB.

Patented Feb. 5, 1924.

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GERSHON BOWMAR, OF TORONTO, ONTARIO, CANADA.

INSULATING HEAD FOR PISTONS.

Application filed August 3, 1922, Serial No. 519,469. Renewed November6, 1923.

To all whom it may concern:

Be it known that I, GERSHON BOWMAR, a subject of the King of GreatBritain, and a resident of the city of Toronto, in the county of York,in the Province of Ontario,

Canada, have invented certain new and useful Improvements in InsulatingHeads for Pistons, of which the following is the specification.

My invention relates to improvements in insulating heads for pistons andthe object of the invention is to devise a piston head in which meansare provided to prevent the heat generated by the explosion of gaseswithin the cylinder from passing through the head and carbonizing theoil therearound in which the head will not be affected by the heat ofthe surrounding body of metal to render it inoperative and which is soconstructed as to render it easily applicable to insertion in a pistonalready constructed and it consists essentially of the arrangement andconstruction of parts as hereinafter more particularly explained.

Fig. 1 represents a sectional view of my piston head with my insulatingmeans applied thereto.

Fig. 2 is a similar view of a modified construction.

In the drawings like characters of reference indicate correspondingparts in each figure.

Referring first to Fig. 1.

1 indicates a piston of which 2 is the head and 3 the side wall. 4 is adisc-like port-ion which is out out of the head comprising that partwithin the side Wall 3. The disc portion a is so cut out as to leave aslight intervening annular space 5 between the edges of the disc and theopposing portion of the piston head when the parts are inserted onewithin the other.

6 is a cupped or dished member formed of sheet metal, the side wall ofwhich is of such a thickness as to fit within the intervening space 5.When the cup 6 is inserted in this position the parts are securedtogether by electric welding or any other suitablemeans.

Between the bottom face of the disc portion 4 and the bottom wall of thecup 6 is formed an intervening space 7 which is filled with asbestoswool or any other suitable non-conducting material. 9 is a perforationformed in the disc at to let out the air as it expands when the deviceis first heated. This perforation is afterwards sealed by any suitablemeans.

In Fig. 2 I show a modified form in which the asbestos filling isdispensed with, the cup member 6 being formed deeper than the cup 6 soas to form an air chamber which, in its self, forms a non-conductingbarrier at the head of the piston.

It will thus be seen that I have devised a very simple, efficient andcompact construction of insulating piston head in which the wrist pinmay be located nearer to the head than is permissible in an ordinaryoonstruction, for the reason that the wrist pin of my construction willnot be affected by the heat passing through the piston head when inclose proximity to the head as in the case in an ordinary constructionof piston.

What I claim as my invention is:

1. In a piston, a head having the central portion located within theside walls of the piston removed to form a separate disc having itsexterior edge slightly spaced apart from the body of the piston, and acupped member having its wall inserted between the disc and the body ofthe piston so that the parts may be electrically welded to gether.

2. In a piston, a head having the central portion located within theside walls of the piston removed to form a separate disc having itsexterior edge slightly spaced apart from the body of the piston, acupped memher having its wall inserted between the disc and the body ofthe piston so that the parts may be electrically welded together, and afilling of non-conducting material inserted within the cupped memberbetween the inner face of the disc portion of the head and the bottom ofthe cup.

GERSHON BOWMAR.

